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Sophie Tedmanson in Sydney ; Times Online When Kaleb Bussenschutt's family sat down for his favourite meal of barbequed chicken on Monday night, he had to watch with envy, munching only on a cup of ice cubes. Kaleb, 5, who lives with his family in Adelaide, South Australia, suffers from a rare allergy that means he cannot stomach any type of food. Australian doctors are baffled by the child's condition, which arose after his mother Melissa tried to wean him off breast milk when he was an infant. "I tried giving him a little bit of a Vegemite sandwich or a tub of yoghurt, but it gave him constant diahorrea," Mrs Bussenschutt told The Times . "I knew something wasn't right so I took him to hospital and they did a biopsy of his stomach and it showed that it was quite red and inflamed and full of ulcers." Doctors initially thought Kaleb was milk or soy intolerant, so put him on a series of diets, including one consisting only of organic foods, but nothing se...